python - 如何在 Dart 中正确使用子类的 super 方法？

Question

最近学习了面向对象的python，这几天一直在尝试学习Dart。但是，我在学习如何创建子类时遇到了困难。

这是我想要在 python 中实现的结果:

class Employee:

  def __init__(self, fistName, lastName, pay):
    self.firstName = firstName
    self.lastName = lastName
    self.pay = pay

class Developer(Employee):

  def __init__(self, firstName, lastName, pay, languages):
    super().__init__(firstName, lastName, pay)
    self.languages = languages

developer = Developer('John', 'Doe', 5000, ['Python', 'Java'])

在 dart 中，这是我到目前为止的代码:

class Employee {

  String firstName;
  String lastName;
  num pay;

  Employee(this.firstName, this.lastName, this.pay);
}

class Developer extends Employee{

  List<String> languages;

  Developer(?);
}

void main(){ 
  var developer = new Developer('John', 'Doe', 5000, ['Python', 'Java'])
}

如何完成代码以便获得与 python 中相同的结果？

Answer 1

你可以这样做

class Employee {

  String firstName;
  String lastName;
  num pay;

  Employee(this.firstName, this.lastName, this.pay);
}

class Developer extends Employee{

  List<String> languages;

  Developer(String firstName, String lastName, num pay, this.languages): super(firstName, lastName, pay);
}

void main(){ 
  var developer = new Developer('John', 'Doe', 5000, ['Python', 'Java']);
}